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[MTD] Factor out OF partition support from the NOR driver. 

Signed-off-by: Scott Wood <scottwood@freescale.com>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
This commit is contained in:
Scott Wood 2008-01-15 17:54:43 -06:00 committed by David Woodhouse
parent c0d2a48a65
commit 9a310d2119
5 changed files with 118 additions and 63 deletions
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8
drivers/mtd/Kconfig
View File

@ -150,6 +150,14 @@ config MTD_AFS_PARTS
for your particular device. It won't happen automatically. The
'armflash' map driver (CONFIG_MTD_ARMFLASH) does this, for example.
config MTD_OF_PARTS
tristate "Flash partition map based on OF description"
depends on PPC_OF && MTD_PARTITIONS
help
This provides a partition parsing function which derives
the partition map from the children of the flash node,
as described in Documentation/powerpc/booting-without-of.txt.
comment "User Modules And Translation Layers"
config MTD_CHAR

1
drivers/mtd/Makefile
View File

@ -11,6 +11,7 @@ obj-$(CONFIG_MTD_CONCAT) += mtdconcat.o
obj-$(CONFIG_MTD_REDBOOT_PARTS) += redboot.o
obj-$(CONFIG_MTD_CMDLINE_PARTS) += cmdlinepart.o
obj-$(CONFIG_MTD_AFS_PARTS) += afs.o
obj-$(CONFIG_MTD_OF_PARTS) += ofpart.o
# 'Users' - code which presents functionality to userspace.
obj-$(CONFIG_MTD_CHAR) += mtdchar.o

89
drivers/mtd/maps/physmap_of.c
View File

@ -80,65 +80,6 @@ static int parse_obsolete_partitions(struct of_device *dev,
return nr_parts;
}
static int __devinit parse_partitions(struct of_flash *info,
struct of_device *dev)
{
const char *partname;
static const char *part_probe_types[]
= { "cmdlinepart", "RedBoot", NULL };
struct device_node *dp = dev->node, *pp;
int nr_parts, i;
/* First look for RedBoot table or partitions on the command
* line, these take precedence over device tree information */
nr_parts = parse_mtd_partitions(info->mtd, part_probe_types,
&info->parts, 0);
if (nr_parts > 0)
return nr_parts;
/* First count the subnodes */
nr_parts = 0;
for (pp = of_get_next_child(dp, NULL); pp;
pp = of_get_next_child(dp, pp))
nr_parts++;
if (nr_parts == 0)
return parse_obsolete_partitions(dev, info, dp);
info->parts = kzalloc(nr_parts * sizeof(*info->parts),
GFP_KERNEL);
if (!info->parts)
return -ENOMEM;
for (pp = of_get_next_child(dp, NULL), i = 0; pp;
pp = of_get_next_child(dp, pp), i++) {
const u32 *reg;
int len;
reg = of_get_property(pp, "reg", &len);
if (!reg || (len != 2*sizeof(u32))) {
of_node_put(pp);
dev_err(&dev->dev, "Invalid 'reg' on %s\n",
dp->full_name);
kfree(info->parts);
info->parts = NULL;
return -EINVAL;
}
info->parts[i].offset = reg[0];
info->parts[i].size = reg[1];
partname = of_get_property(pp, "label", &len);
if (!partname)
partname = of_get_property(pp, "name", &len);
info->parts[i].name = (char *)partname;
if (of_get_property(pp, "read-only", &len))
info->parts[i].mask_flags = MTD_WRITEABLE;
}
return nr_parts;
}
#else /* MTD_PARTITIONS */
#define OF_FLASH_PARTS(info) (0)
#define parse_partitions(info, dev) (0)
@ -213,6 +154,10 @@ static struct mtd_info * __devinit obsolete_probe(struct of_device *dev,
static int __devinit of_flash_probe(struct of_device *dev,
const struct of_device_id *match)
{
#ifdef CONFIG_MTD_PARTITIONS
static const char *part_probe_types[]
= { "cmdlinepart", "RedBoot", NULL };
#endif
struct device_node *dp = dev->node;
struct resource res;
struct of_flash *info;
@ -275,13 +220,33 @@ static int __devinit of_flash_probe(struct of_device *dev,
}
info->mtd->owner = THIS_MODULE;
err = parse_partitions(info, dev);
#ifdef CONFIG_MTD_PARTITIONS
/* First look for RedBoot table or partitions on the command
* line, these take precedence over device tree information */
err = parse_mtd_partitions(info->mtd, part_probe_types,
&info->parts, 0);
if (err < 0)
goto err_out;
return err;
#ifdef CONFIG_MTD_OF_PARTS
if (err == 0) {
err = of_mtd_parse_partitions(&dev->dev, info->mtd,
dp, &info->parts);
if (err < 0)
return err;
}
#endif
if (err == 0) {
err = parse_obsolete_partitions(dev, info, dp);
if (err < 0)
return err;
}
if (err > 0)
add_mtd_partitions(info->mtd, OF_FLASH_PARTS(info), err);
add_mtd_partitions(info->mtd, info->parts, err);
else
#endif
add_mtd_device(info->mtd);
return 0;

74
drivers/mtd/ofpart.c Normal file
View File

@ -0,0 +1,74 @@
/*
* Flash partitions described by the OF (or flattened) device tree
*
* Copyright (C) 2006 MontaVista Software Inc.
* Author: Vitaly Wool <vwool@ru.mvista.com>
*
* Revised to handle newer style flash binding by:
* Copyright (C) 2007 David Gibson, IBM Corporation.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/of.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/partitions.h>
int __devinit of_mtd_parse_partitions(struct device *dev,
struct mtd_info *mtd,
struct device_node *node,
struct mtd_partition **pparts)
{
const char *partname;
struct device_node *pp;
int nr_parts, i;
/* First count the subnodes */
pp = NULL;
nr_parts = 0;
while ((pp = of_get_next_child(node, pp)))
nr_parts++;
if (nr_parts == 0)
return 0;
*pparts = kzalloc(nr_parts * sizeof(**pparts), GFP_KERNEL);
if (!*pparts)
return -ENOMEM;
pp = NULL;
i = 0;
while ((pp = of_get_next_child(node, pp))) {
const u32 *reg;
int len;
reg = of_get_property(pp, "reg", &len);
if (!reg || (len != 2 * sizeof(u32))) {
of_node_put(pp);
dev_err(dev, "Invalid 'reg' on %s\n", node->full_name);
kfree(*pparts);
*pparts = NULL;
return -EINVAL;
}
(*pparts)[i].offset = reg[0];
(*pparts)[i].size = reg[1];
partname = of_get_property(pp, "label", &len);
if (!partname)
partname = of_get_property(pp, "name", &len);
(*pparts)[i].name = (char *)partname;
if (of_get_property(pp, "read-only", &len))
(*pparts)[i].mask_flags = MTD_WRITEABLE;
i++;
}
return nr_parts;
}
EXPORT_SYMBOL(of_mtd_parse_partitions);

9
include/linux/mtd/partitions.h
View File

@ -71,5 +71,12 @@ extern int parse_mtd_partitions(struct mtd_info *master, const char **types,
#define put_partition_parser(p) do { module_put((p)->owner); } while(0)
#endif
struct device;
struct device_node;
int __devinit of_mtd_parse_partitions(struct device *dev,
struct mtd_info *mtd,
struct device_node *node,
struct mtd_partition **pparts);
#endif